Are the sonic hedgehog characters voicing auditions and recording booths are held at San Diego?

There's no public information suggesting that voice auditions or recordings for Sonic the Hedgehog characters are held specifically in San Diego.

Here's why:

* Voice acting is a global industry: Voice actors work remotely, often recording from their own studios.

* Production locations vary: While some voice recordings might happen at a studio in Los Angeles (close to San Diego), it's more likely that voice actors record from their own home studios or professional recording facilities anywhere in the world.

* No official announcements: There's no news or announcements from Sega or the voice actors themselves that suggest San Diego is a specific location for their recordings.

It's important to note that the location of voice recording sessions can change depending on the specific project and the availability of the voice actors.